For regular people I'd have to go with my dad. He did a great job raising us after my mom died and still helps me out all of the time.
For famous people I'd go with LeVar Burton. I think it's so awesome what I did with Reading Rainbow and how he continues to promote education. He's the only celebrity that I've met and talked to and I was so happy to find out how nice he was. He's also on my favorite show (Star trek TNG)